The carbon quantum dots with uniform particle size and excellent fluorescence were synthesized by one step method in the condition of high pressure reaction kettle.Fe3O4 nanoparticles prepared by coprecipitation were modified by poly dopamine(PDA),Fe3O4/PDA microspheres were obtained.Fe3O4 nanoparticles were connected with carbon quantum dots by poly dopamine for the first time.Multifunctional composite microspheres Fe3O4/PDA@CQDs were synthesized,which regarded carbon quantum dots as fluorescent materials.The nanocomposites were characterized by fourier transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD),vibrating sample magnetometer (VSM),transmission electron microscopy (TEM) and fluorescence spectrophotometer.The results showed that the particle diameter of carbon quantum dots was about 10nm,the size of composite nanoparticles was about 40nm.More importantly,the nanoparticles had good dispersion,excellent magnetic response and fluorescence.The magnetic nanocomposite of carbon quantum dots had no toxicity and high biocompatibility,which can replace the magnetic nanocomposite of semiconductor quantum dots and be applied in the field of life science,such as medicine separation,visualization,targeted therapy and so on.
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基金资助
国家自然科学基金(51103120)
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